These days, the medicine cabinet is truly a family affair. More than a quarter of U.S. kids and teens are taking a medication on a chronic basis, according to Medco Health Solutions Inc., the biggest U.S. pharmacy-benefit manager with around 65 million members. Nearly 7% are on two or more such drugs, based on the company's database figures for 2009. Doctors and parents warn that prescribing medications to children can be problematic. There is limited research available about many drugs' effects in kids. And healthcare providers and families need to be vigilant to assess the medicines' impact, both intended and not. Although the effects of some medications, like cholesterol-lowering statins, have been extensively researched in adults, the consequences of using such drugs for the bulk of a patient's lifespan are little understood.